package com.ia.aistream.common.utils.file;

import com.ia.aistream.common.config.Global;
import com.ia.aistream.common.constant.Constants;
import com.ia.aistream.common.exception.file.FileNameLengthLimitExceededException;
import com.ia.aistream.common.exception.file.FileSizeLimitExceededException;
import com.ia.aistream.common.exception.file.InvalidExtensionException;
import com.ia.aistream.common.utils.DateUtils;
import com.ia.aistream.common.utils.StringUtils;
import com.ia.aistream.common.utils.file.config.FileConfig;
import com.ia.aistream.common.utils.file.dto.FileDataDto;
import com.ia.aistream.common.utils.security.Md5Utils;
import com.ia.aistream.common.utils.spring.SpringUtils;
import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 文件上传工具类
 * 
 * @author ruoyi
 */
public class FileUploadUtils
{
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 1;



    /**
     * 默认上传的地址
     */
    private static String defaultBaseDir = Global.getProfile();

    private static int counter = 0;

    public static void setDefaultBaseDir(String defaultBaseDir)
    {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir()
    {
        return defaultBaseDir;
    }

    /**
     * 以默认配置进行文件上传
     *
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final FileDataDto upload(MultipartFile file) throws IOException
    {
        try
        {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final FileDataDto upload(String baseDir, MultipartFile file) throws IOException
    {
        try
        {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException 比如读写文件出错时
     * @throws InvalidExtensionException 文件校验异常
     */
    public static final FileDataDto upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException
    {
        FileConfig fileConfig = SpringUtils.getBean("fileConfig", FileConfig.class);
        FileDataDto fileDataDto = new FileDataDto();
        //设置文件大小
        fileDataDto.setFileSize(file.getSize());
        fileDataDto.setCreateTime(new Date());
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > (FileUploadUtils.DEFAULT_FILE_NAME_LENGTH * fileConfig.getFileNameLength()))
        {
            throw new FileNameLengthLimitExceededException((FileUploadUtils.DEFAULT_FILE_NAME_LENGTH * fileConfig.getFileNameLength()));
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file,fileDataDto);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        fileDataDto.setFilePath(pathFileName);
        return fileDataDto;
    }

    public static final FileDataDto uploadFileName(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException
    {
        FileConfig fileConfig = SpringUtils.getBean("fileConfig", FileConfig.class);
        FileDataDto fileDataDto = new FileDataDto();
        //设置文件大小
        fileDataDto.setFileSize(file.getSize());
        fileDataDto.setCreateTime(new Date());
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > (FileUploadUtils.DEFAULT_FILE_NAME_LENGTH * fileConfig.getFileNameLength()))
        {
            throw new FileNameLengthLimitExceededException((FileUploadUtils.DEFAULT_FILE_NAME_LENGTH * fileConfig.getFileNameLength()));
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractDwgFilename(file,fileDataDto);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        fileDataDto.setFilePath(pathFileName);
        return fileDataDto;
    }

    /*****/
    public static final FileDataDto uploadFileNameVisio(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException
    {
//        FileConfig fileConfig = SpringUtils.getBean("fileConfig", FileConfig.class);
        String baseDir = "D:/template/";
        FileDataDto fileDataDto = new FileDataDto();
        //设置文件大小
        fileDataDto.setFileSize(file.getSize());
        fileDataDto.setCreateTime(new Date());
//        int fileNamelength = file.getOriginalFilename().length();
//        if (fileNamelength > (FileUploadUtils.DEFAULT_FILE_NAME_LENGTH * fileConfig.getFileNameLength()))
//        {
//            throw new FileNameLengthLimitExceededException((FileUploadUtils.DEFAULT_FILE_NAME_LENGTH * fileConfig.getFileNameLength()));
//        }

//        assertAllowed(file, allowedExtension);

//        String fileName = extractDwgFilename(file,fileDataDto);

//        File desc = getAbsoluteFile(baseDir, fileName);
        String fileName = file.getOriginalFilename();
        String contentType = file.getContentType();
        fileDataDto.setFileName(fileName);
        String originalFilename = fileName.replaceAll("."+ contentType,"");
        fileDataDto.setFileName(originalFilename);
        fileDataDto.setFileExt("vsdx");
        fileDataDto.setFileType("file");
        fileDataDto.setFileSize(100L);
        fileDataDto.setDownloadUrl("/" + fileName);
        fileDataDto.setFileRealName(contentType);

        File desc = new File(baseDir + fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        fileDataDto.setFilePath(pathFileName);
        return fileDataDto;
    }
    /***
     * 实现Word文件上传
     * @param baseDir
     * @param file
     * @param allowedExtension
     * @return
     * @throws FileSizeLimitExceededException
     * @throws IOException
     * @throws FileNameLengthLimitExceededException
     * @throws InvalidExtensionException
     */
    public static final FileDataDto uploadWordFileName(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException
    {
        FileConfig fileConfig = SpringUtils.getBean("fileConfig", FileConfig.class);
        FileDataDto fileDataDto = new FileDataDto();
        //设置文件大小
        fileDataDto.setFileSize(file.getSize());
        fileDataDto.setCreateTime(new Date());
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > (FileUploadUtils.DEFAULT_FILE_NAME_LENGTH * fileConfig.getFileNameLength()))
        {
            throw new FileNameLengthLimitExceededException((FileUploadUtils.DEFAULT_FILE_NAME_LENGTH * fileConfig.getFileNameLength()));
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractWordFilename(file,fileDataDto);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        fileDataDto.setFilePath(pathFileName);
        return fileDataDto;
    }
    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file,FileDataDto fileDataDto)
    {
        String extension = getExtension(file);
        // 处理ie上传文件问题
        String fname = file.getOriginalFilename();
        if(fname.contains("\\")){
            fname = fname.substring(fname.lastIndexOf("\\")+1);
        }
        String originalFilename = fname.replaceAll("."+extension,"");
        fileDataDto.setFileName(originalFilename);
        fileDataDto.setFileExt(extension);
        String realName = originalFilename + "_" + encodingFilename(originalFilename) + "." + extension;
        fileDataDto.setFileRealName(realName);
        String fileName = extension + "/" +DateUtils.datePath() + "/" + realName;
        fileDataDto.setDownloadUrl("/" + fileName);
        if(isAllowedExtension(extension,MimeTypeUtils.IMAGE_EXTENSION)){
            fileDataDto.setFileType("image");
        }else {
            fileDataDto.setFileType("file");
        }
        return fileName;
    }

    /***
     * 处理Word文件编码
     * @param file
     * @param fileDataDto
     * @return
     */
    public static final String extractWordFilename(MultipartFile file,FileDataDto fileDataDto)
    {
        String extension = getExtension(file);
        // 处理ie上传文件问题
        String fname = file.getOriginalFilename();
        if(fname.contains("\\")){
            fname = fname.substring(fname.lastIndexOf("\\")+1);
        }

        String originalFilename = fname.replaceAll("."+extension,"");
        fileDataDto.setFileName(originalFilename);

        // 处理文件名
        originalFilename = handleFileName(originalFilename);

        fileDataDto.setFileExt(extension);
        String realName = originalFilename + "_" + encodingFilename(originalFilename) + "." + extension;
        fileDataDto.setFileRealName(realName);
        String fileName = extension + "/" +DateUtils.datePath() + "/" + realName;
        fileDataDto.setDownloadUrl("/" + fileName);
        if(isAllowedExtension(extension,MimeTypeUtils.IMAGE_EXTENSION)){
            fileDataDto.setFileType("image");
        }else {
            fileDataDto.setFileType("file");
        }
        return fileName;
    }

    // 处理文件名
    public static String handleFileName(String fileName){
        String reg = ".*[A-Z]*-[A-Z]*\\d+";
        Pattern pattern = Pattern.compile(reg);
        Matcher matcher = pattern.matcher(fileName);
        String group = "";
        if(matcher.find()){
            group = matcher.group();
        }

        String ver = "";
        if(fileName.contains("_")){
            ver = fileName.substring(fileName.lastIndexOf("_"));
        }
        return group + ver;
    }
    public static final String extractDwgFilename(MultipartFile file,FileDataDto fileDataDto)
    {
        String extension = getExtension(file);
        // 处理ie上传文件问题
        String fname = file.getOriginalFilename();
        fname = fname.replace(" ", "");
        if(fname.contains("\\")){
            fname = fname.substring(fname.lastIndexOf("\\")+1);
        }
        String originalFilename = fname.replaceAll("."+extension,"");
        fileDataDto.setFileName(originalFilename);
        fileDataDto.setFileExt(extension);
        String realName = originalFilename + "_" + encodingFilename(originalFilename) + "." + extension;
        fileDataDto.setFileRealName(realName);
        String fileName = extension + "/" +DateUtils.datePath() + "/" + realName;
        fileDataDto.setDownloadUrl("/" + fileName);
        if(isAllowedExtension(extension,MimeTypeUtils.IMAGE_EXTENSION)){
            fileDataDto.setFileType("image");
        }else {
            fileDataDto.setFileType("file");
        }
        return fileName;
    }
    private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException
    {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.getParentFile().exists())
        {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists())
        {
            desc.createNewFile();
        }
        return desc;
    }

    private static final String getPathFileName(String uploadDir, String fileName) throws IOException
    {
        int dirLastIndex = Global.getProfile().length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        String pathFileName = Constants.RESOURCE_PREFIX + (StringUtils.isEmpty(currentDir) ? "":"/"+currentDir) + "/" + fileName;
        return pathFileName;
    }

    /**
     * 编码文件名
     */
    private static final String encodingFilename(String fileName)
    {
        fileName = fileName.replace("_", " ");
        fileName = Md5Utils.hash(fileName + System.nanoTime() + counter++);
        return fileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException
    {
        FileConfig fileConfig = SpringUtils.getBean("fileConfig", FileConfig.class);
        long size = file.getSize();
        if ((fileConfig.getMaxSize() * DEFAULT_MAX_SIZE) != -1 && size > (fileConfig.getMaxSize() * DEFAULT_MAX_SIZE))
        {
            throw new FileSizeLimitExceededException((fileConfig.getMaxSize() * DEFAULT_MAX_SIZE) / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();

        // 修改IE上传文件后，包含文件路径
        if(fileName.contains("\\")){
            fileName = fileName.substring(fileName.lastIndexOf("\\")+1);
        }
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension))
        {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            }
            else
            {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension)
    {
        for (String str : allowedExtension)
        {
            if (str.equalsIgnoreCase(extension))
            {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     * 
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file)
    {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension))
        {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }
}